Spoke-Type IPM Rotor Structure With Hollow Cooling Cavity
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Solution Overview
Problem
Existing rotors for spoke-type internal permanent magnet (IPM) motors incorporate non-magnetic cores that increase production effort, weight, and component count, necessitating a more efficient and lightweight design.
Innovation Solution
The rotor design features a shaft with a coaxially arranged annular rotor body, comprising alternating rotor stack segments and magnets, with a cavity between the shaft and rotor body for air cooling and reduced weight, utilizing separate elements and support rings for stabilization and torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a non-magnetic core is used in the rotor, then the structural stability is improved, but the weight increases and production effort increases
Solution Approach 1:
The invention extracts and removes the non-magnetic core from the rotor structure. Instead of using a separate non-magnetic core component, the rotor body itself is designed as a hollow cylindrical structure that directly serves as the mounting structure for magnets and rotor stack segments, eliminating the need for additional non-magnetic core material and reducing overall rotor weight.
Solution Approach 2:
The invention merges the functions of the non-magnetic core with the rotor body structure. The hollow cylindrical rotor body simultaneously provides structural support, magnetic path containment, and mounting surfaces for magnets and rotor stack segments, consolidating multiple functions into a single integrated component.
2Stability of the object's composition
If a non-magnetic core is used in the rotor, then the structural stability is improved, but the number of components increases
Solution Approach 1:
The invention extracts and removes the non-magnetic core from the rotor structure. Instead of using a separate non-magnetic core component, the rotor body itself is designed as a hollow cylindrical structure that directly serves as the mounting structure for magnets and rotor stack segments, eliminating the need for additional non-magnetic core material and reducing overall rotor weight.
Solution Approach 2:
The invention merges the functions of the non-magnetic core with the rotor body structure. The hollow cylindrical rotor body simultaneously provides structural support, magnetic path containment, and mounting surfaces for magnets and rotor stack segments, consolidating multiple functions into a single integrated component.
3Weight of moving object
If the rotor body is arranged close to the shaft, then the weight is reduced, but cooling capability deteriorates
Solution Approach 1:
The invention utilizes the radial dimension by creating a hollow cylindrical rotor body with an inner cavity that provides a cooling channel. This radial hollow structure allows cooling air to flow through the rotor body without significantly increasing the overall rotor dimensions or weight, effectively adding a cooling function in the radial dimension.
Solution Approach 2:
The invention implements a pneumatic cooling system by introducing cooling air channels through the hollow cylindrical rotor body. The inner cavity of the rotor body serves as a passage for cooling air flow, enabling effective thermal management through fluid (air) circulation without requiring additional heavy cooling components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design reduces weight and cost while effectively cooling the shaft and rotor body, enhancing magnetic properties and stability through separate elements and air-cooling, without the need for non-magnetic cores.
Implementation Method 1
the shaft and the rotor body can be cooled by air in the cavity
Implementation Method 2
the shaft and the rotor body can be cooled by air in the cavity
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a rotor (1) for an electric machine, especially a spoke-type internal-permanent-magnet motor. The rotor (1) comprises a shaft (2) and an annular rotor body (3). The shaft (2) is arranged in the rotor body (3) at a distance, so that an annular cavity (8) is formed between the shaft (2) and the rotor body (3).